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Thread: PostgreSQL equivalent to Oracles ANYDATASET

PostgreSQL equivalent to Oracles ANYDATASET

From

Dirk Mika

Date:

13 November 2020, 19:56:50

Hello,

we’re currently using Oracle and have a few functions in some packages, which are defined e.g. as follows:

FUNCTION get_results(p_id_series series.id_series%TYPE)

RETURN ANYDATASET

PIPELINED USING t_series_get_results;

It can be called like:

SELECT * FROM TABLE(series_pkg.get_results(1));

The purpose of this function is to provide a DATASET, which has different columns in the result depending on the passed parameter.

Is there any way to achieve something similar in PostreSQL?

Dirk

--
Dirk Mika
Software Developer

mika:timing GmbH
Strundepark - Kürtener Str. 11b
51465 Bergisch Gladbach
Germany

fon +49 2202 2401-1197
dirk.mika@mikatiming.de
www.mikatiming.de

AG Köln HRB 47509 * WEEE-Reg.-Nr. DE 90029884
Geschäftsführer: Harald Mika, Jörg Mika

Attachment

Re: PostgreSQL equivalent to Oracles ANYDATASET

From

Pavel Stehule

Date:

13 November 2020, 20:04:49

pá 13. 11. 2020 v 17:57 odesílatel Dirk Mika <Dirk.Mika@mikatiming.de> napsal:

Hello,

we’re currently using Oracle and have a few functions in some packages, which are defined e.g. as follows:

FUNCTION get_results(p_id_series series.id_series%TYPE)
RETURN ANYDATASET
PIPELINED USING t_series_get_results;

It can be called like:

SELECT * FROM TABLE(series_pkg.get_results(1));

The purpose of this function is to provide a DATASET, which has different columns in the result depending on the passed parameter.

Is there any way to achieve something similar in PostreSQL?

Currently there is not this possibility

Theoretically you can use a function, that returns refcursor, and outside function you can read this cursor

http://okbob.blogspot.com/2008/08/using-cursors-for-generating-cross.html

Regards

Pavel

BR
Dirk
--
Dirk Mika
Software Developer

mika:timing GmbH
Strundepark - Kürtener Str. 11b
51465 Bergisch Gladbach
Germany

fon +49 2202 2401-1197
dirk.mika@mikatiming.de
www.mikatiming.de

AG Köln HRB 47509 * WEEE-Reg.-Nr. DE 90029884
Geschäftsführer: Harald Mika, Jörg Mika

Attachment

Re: PostgreSQL equivalent to Oracles ANYDATASET

From

Christoph Moench-Tegeder

Date:

13 November 2020, 20:23:01

## Dirk Mika (Dirk.Mika@mikatiming.de):

> SELECT * FROM TABLE(series_pkg.get_results(1));
> 
> The purpose of this function is to provide a DATASET, which has
> different columns in the result depending on the passed parameter.
> 
> Is there any way to achieve something similar in PostreSQL?

testing=# CREATE OR REPLACE FUNCTION public.rr(p INTEGER)
 RETURNS SETOF RECORD
 LANGUAGE plpgsql
AS $function$
BEGIN
  IF p = 1 THEN
    RETURN NEXT ('k1'::TEXT, 'v1'::TEXT);
    RETURN NEXT ('k2'::TEXT, 'v2'::TEXT);
  ELSE
    RETURN NEXT (23::INTEGER, 42::INTEGER, 'abc'::TEXT);
    RETURN NEXT (42::INTEGER, 23::INTEGER, 'xyz'::TEXT);
  END IF;
  RETURN;
END;
$function$;
CREATE FUNCTION

testing=# SELECT * FROM rr(2) f(a INTEGER, b INTEGER, c TEXT);
 a  | b  |  c
----+----+-----
 23 | 42 | abc
 42 | 23 | xyz
(2 rows)

testing=# SELECT * FROM rr(1) f(x TEXT, y TEXT);
 x  | y
----+----
 k1 | v1
 k2 | v2
(2 rows)

Regards,
Christoph

-- 
Spare Space

Re: PostgreSQL equivalent to Oracles ANYDATASET

From

Dirk Mika

Date:

14 November 2020, 14:20:29

Hi,

many thanks for this suggestion. But the problem with this is that you have to know which columns are returned when you call the function.

Regards

Dirk

--
Dirk Mika
Software Developer

mika:timing GmbH
Strundepark - Kürtener Str. 11b
51465 Bergisch Gladbach
Germany

fon +49 2202 2401-1197
dirk.mika@mikatiming.de
www.mikatiming.de

AG Köln HRB 47509 * WEEE-Reg.-Nr. DE 90029884
Geschäftsführer: Harald Mika, Jörg Mika

Von: Christoph Moench-Tegeder <cmt@burggraben.net>
Datum: Freitag, 13. November 2020 um 18:23
An: Dirk Mika <Dirk.Mika@mikatiming.de>
Cc: "pgsql-general@lists.postgresql.org" <pgsql-general@lists.postgresql.org>
Betreff: Re: PostgreSQL equivalent to Oracles ANYDATASET

## Dirk Mika (Dirk.Mika@mikatiming.de):

SELECT * FROM TABLE(series_pkg.get_results(1));
The purpose of this function is to provide a DATASET, which has
different columns in the result depending on the passed parameter.
Is there any way to achieve something similar in PostreSQL?

testing=# CREATE OR REPLACE FUNCTION public.rr(p INTEGER)

RETURNS SETOF RECORD

LANGUAGE plpgsql

AS $function$

BEGIN

IF p = 1 THEN

RETURN NEXT ('k1'::TEXT, 'v1'::TEXT);

RETURN NEXT ('k2'::TEXT, 'v2'::TEXT);

ELSE

RETURN NEXT (23::INTEGER, 42::INTEGER, 'abc'::TEXT);

RETURN NEXT (42::INTEGER, 23::INTEGER, 'xyz'::TEXT);

END IF;

RETURN;

END;

$function$;

CREATE FUNCTION

testing=# SELECT * FROM rr(2) f(a INTEGER, b INTEGER, c TEXT);

a | b | c

----+----+-----

23 | 42 | abc

42 | 23 | xyz

(2 rows)

testing=# SELECT * FROM rr(1) f(x TEXT, y TEXT);

x | y

----+----

k1 | v1

k2 | v2

(2 rows)

Regards,

Christoph

Spare Space

Attachment

mt_c1c59b3d-dd43-4ca6-992b-79f5a19f5999.png

Re: PostgreSQL equivalent to Oracles ANYDATASET

From

Dirk Mika

Date:

14 November 2020, 17:22:38

Hi,

That looks promising. I'll take a closer look at that.

Regards

Dirk

--
Dirk Mika
Software Developer

mika:timing GmbH
Strundepark - Kürtener Str. 11b
51465 Bergisch Gladbach
Germany

fon +49 2202 2401-1197
dirk.mika@mikatiming.de
www.mikatiming.de

AG Köln HRB 47509 * WEEE-Reg.-Nr. DE 90029884
Geschäftsführer: Harald Mika, Jörg Mika

Von: Pavel Stehule <pavel.stehule@gmail.com>
Datum: Freitag, 13. November 2020 um 18:05
An: Dirk Mika <Dirk.Mika@mikatiming.de>
Cc: "pgsql-general@lists.postgresql.org" <pgsql-general@lists.postgresql.org>
Betreff: Re: PostgreSQL equivalent to Oracles ANYDATASET

pá 13. 11. 2020 v 17:57 odesílatel Dirk Mika <Dirk.Mika@mikatiming.de> napsal:

Hello,

we’re currently using Oracle and have a few functions in some packages, which are defined e.g. as follows:

FUNCTION get_results(p_id_series series.id_series%TYPE)
RETURN ANYDATASET
PIPELINED USING t_series_get_results;

It can be called like:

SELECT * FROM TABLE(series_pkg.get_results(1));

The purpose of this function is to provide a DATASET, which has different columns in the result depending on the passed parameter.

Is there any way to achieve something similar in PostreSQL?

Currently there is not this possibility

Theoretically you can use a function, that returns refcursor, and outside function you can read this cursor

http://okbob.blogspot.com/2008/08/using-cursors-for-generating-cross.html

Regards

Pavel

BR
Dirk
--
Dirk Mika
Software Developer

mika:timing GmbH
Strundepark - Kürtener Str. 11b
51465 Bergisch Gladbach
Germany
fon +49 2202 2401-1197
dirk.mika@mikatiming.de
www.mikatiming.de
AG Köln HRB 47509 * WEEE-Reg.-Nr. DE 90029884
Geschäftsführer: Harald Mika, Jörg Mika